Starting and stopping mechanism.



T. G. PLANT.

AND STOPPING MECHANISM.

smn'rme APPLIOA'IION PILB D 0073.4, 1906. RENEWED NOV. 22, 1909.

Patented may 17, 1910.

4 SHEETS-8113B! 1.

APPLIOATION FILED 0013.4, 1908. BEN

Patented May 17, 1910.

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T. G. PLANT. STARTING AND STOPPING MECHANISM. Arrmpnlon IILED'OOTA,190s. gnnnwnn Nov. 22, 1909.

958,290, Patented May 1?, 1910.

4 SHEETS-SHEET 3.

T. G. PLANT. STARTING AND STOPPING MECHANISM. APPLICATION FILED 00m,1906. RENEWED NOV. 22, 1909.

Patented May 17, 1910.

4 SHEETS-SHEET 4.

in" *5 WWW? l. A infil Sllfltfllllbr AND STOPPING MECHANISM.

Specification of LettcrS Patent.

Patentedll/llay N, 191d.

Application filedflctober l, 1906,.Se1'ia1 No. 337,339. Renewed November22, 1909. -Seria1*No. 529,298.

-To. all whom it. may, QORQEWL.

of which the following description, in connection with the accompanyingdrawings, is a specification, like numerals on-the drawings,representing like parts.

in-many. machines, particularly in sewing iandbther machinescmployed inboot and shoe work,.it is desirable at the end of any pieeeofworktostopthe machine always, at agiven and :certain point in its cycle ofmovement. 5111 some i machines, particularly in chain-stitchscwingmachines, it is desirable 'fter theforwardmotion of the machine lrestedtogive-to it a return or-retractive movement, to cause its needleto cast ed the last, loop theroomto permit the work to be withdrawn.

My present invention .aims to provide ncveland-improved nieansforarresting or stopping amacliine,particularly a sewing machine, ialwaysrat a given, predetermined, or normal position, and :also meansautomatically'to produce-in connection with such sto ping of themachinea predetermined or suc'oisnt return or retractive movement thereof, orof such part-thereof as may be necessary or desired, for the purposeabove mentinned. or otherwise.

My invention will be understood best-from a descriptionof .a machineillustrating one embodiment thereof, such for instance as shown in theaccompanying drawings, wherein-- rFigurezl isa front elevation of acurved needle waathread sewing machine of the type commonly-used in themanufacture of boots shoes and known as a welter;

' Fig. '2iswmainly a vertical section along the axis of thedrivingshaft-showing the principal parts of the mechanism illustratingthe embodiment of my invention here shown; Fig. 3 is a vertical sectionon the dotted line 33, Fig. 2, looking to the right; Figs. l and 5 arevertical sections on the lines i l and 5-5 respectively, of Fig. 2,looking to the right.

:ln theparticular embodimentof my in vention selected for illustrationherein and shown in the drawings the-sewing machine illustrated and inconnection withwhlch my invention 1s. especially, but i not exclusively,

adapted may be of any desired type, so far as my inventionis concerned.

The main shaft typified at 3, the needle, its carrier and actuatingmeanstherefor, the feedslide 21, the awl 19, arranged to be movedtherewith, and the ,awlactuating means, the channel feed-guide 30, alsocarried by said feed-slide, the looper 36, the back gage 107, slide rest98 and locking means therefor, thcwaxing means 175, with the-operatingmeans'for these parts: together with any associated or concomitant partsare or may be of desired construction. It is assumed that machines ofthis type are understood bythose-skilled in the: art and that no furtherdescription is necessary herein.

Referring now particularly to Fig. 2 at 86g., the main shaft 3 isshown.- extended to the right beyond the endmost shaft bearing and hasloosely 'journaled about its outer end a suitable belt or driving-pulley250, said, pulley being restrained at-the right against outward movementon said shaft by a cap or washer 251. At its'inner side face the hub ofsaid pulleyis-provided with a driving-lug 252 adapted to coiiperate withan oppositely facing driving-lug 253 on the end of a hollow orcup-shaped cylindrical sleeve 25 i mounted to slide endwise on saidshaft. t its inner end said sleeve is provided with a circumferentialgroove 255 which receives the forked arm of a bellcranked lever 25G,fulcrumed at 257 and controlled by a rod 258 dependingto a treadle orother suitable member, not shown. Concentrically arranged within andhaving rotative movement relative to said sleeve 25d is a second sleeve259 circumferentially grooved to receive one or more guide-studs 260seated in and projecting through said outer sleeve 254 and held inposition by screws 261 tapped in-said outer sleeve. The studs may bescrewed to a seat in-said outer sleeve so as to hold them firmly inposition, but their heads prevent the ends of said studs from contactingwith the bottom of the groove which they enter, thus insuring at alltimes free runnin engagement between the studs and the we ls of saidgroove.

The inner sleeve 259 is counter-bored interiorly to receive a air ofnested coilsprings 262 separated 1f desired by a spacing ring .263, theopposite .ends of said springsbeing respectively engaged with or enteredinto the ends of said outer and inner sleeves 25d and 259, so that saidsprings will be put under or relieved of tension by rela- I directionsproperly to cooperate with the end tive rotation of the sleeves. lugsupon said collar; so that whereas the The inner end face of the outersleeve engagement of the outer sleeve lug with the is provided with aninternal lug 26%- adapted driving-pulley and the inner sleeve lug withwhen in proper position to engage with an the shaft collar was adaptedto. drive the oppositely-facing cooperative lug 265 on the sald shaft inone direction, when said sleeves adjacent end of a collar 266 fastenedupon are shifted to disengage the inner sleeve lu said shaft 8. At itsopposite end said col from the collar and connect the oppositely lar isprovided with an oppositely-facing facing outer sleeve lug with saidcollar, the lug 267 adapted when in proper position to parts are now incondition to permit of opcooperate with a corresponding lug 268 onposite rotation of the shaft by said concenthe inner face of the end ofsaid inner sleeve tllc ev s- In other Words, Said e s 259. The length ofsaid collar 266 is such Which are connected by the contained s ringsthat only one of its end lugs can be in en- 1 COI1St1tute a yieldingsingle meml fer or gagement at a time with the cooperating 11 11 t0Speak, WheI 1 moved into position 30 and opposed lugs upon the inner andouter at the rlgnt, as n F 1g.. 2, are adapted to sleeves described,said sleeves being mounted dllve h haf 3 111 ne dlrectlon, and when toslide on said shaft to cause their respective internal end lugsalternately to engage the end lugs of said collar. In the drawing, Fig.2, the lug at the left end of said collar is shown in engagement withthe lug on the end of the inner sleeve 259.

In the position shown, rotation of the driving or belt-pulley 250 willact correspondingly to rotate the outer sleeve 254, causing thewholewhen first set in rotation to operate through the connectingsprings 262 to drag after it the correspondingly rotating inner sleeve259. The inner sleeve in turn, through its lug 268, acts upon the lug267 of the collar 266 to impart rotation in the same direction to theshaft 3 and to the machine. The effort required to start the shaft andthe machine through the springs described will cause the latter at firstto be put under tension, but as the ma chine gathers speed said springswill gradw ally recover and resume their normal (.011- dition in whichthey are sufficiently strong to operate the machine continuously.

lVhen it is desired to stop the machine the treadle, which has beenmaintained depressed in the position shown in Fig. 2 during theoperation of the machine, is released to permit the spring 269, Fig. 2,to lift the same and shift the concentric sleeves 254;, 259, to the lefton said shaft and relative to said collar to disengage the outer sleevelug 253 from the hub lug 252 of the driving-pulley, and thereby to cutoff the driving power to permit the machine to stop. This movement ofsaid concentric sleeves at the same time throws the inner lug 264 of theouter sleeve into the path of and for engagement with the end. lug 265of the collar 266, simultaneously disengaging the opposite collar lug267 from the inner sleeve lug 268. As has been stated, the lugs atopposite ends of the collar 266 face in opposite directions, one beingadapted to rotate said collar and its connected shaft in one directionand the other in an opposite direction; and also, as stated, the lugsupon the ends of the outer and inner sleeves 254, 259, face in oppositesite direction. When in position at the right, 5 as shown, said sleevesare connected, also as shown, with the driving-pulley to drive them andthe contained shaft in one direction to operate the machine. When slidto the left into opposite engagement with said shaft they are adapted,if restraint be exercised upon rotation of the sleeves, either graduallyto stop the shaft in engagement therewith or, if desired, to impartopposite or retractive movement thereto. For this purpose the innersleeve is provided at its outer end face (see Figs. 2 and 3) with asegmental lug or cam 270 upwardly inclined at one end and abruptlyterminating in a stop face at its opposite end, and adapted when saidsleeve is in its position at the left, Fig. 2, to be brought into thepath of the stopend 271 of a lever 272 fulcrumed at 273 on one of thestandards of the machine. Said lever has a second arm I 274 which(see-Fig. 2) is fitted at its 611Cl with an upwardly-facing brake-shoe2'75 adapted to engage an internal cylindrical brake surface 276 on oneof the cams 28, or on some other disk or member of the machine thatrotates or is in motion when the machine is in operation.

The lever 272 (see Fig. 3) has a laterally extended arm, shown in dottedlines, which is fitted at its outer end with a cushion or rubber plug277 adapted, when the lever is thrown to the left (see Fig. 3), tocontact with an adjustable stop-screw 27 8 on the machine standardreferred to.

The corresponding end of the outer sleeve cam or stop surface lug 279inclined at one end and abruptly terminated or provided with a. stopsurface at its other end; the stop surfaces of the two lugs 270 and 279on the two sleeves, also the inclined surfaces 1 5 thereof, face inopposite directions, said lug 270 being also preferably somewhat higherthan the lug 279.

WVhen now the machine is in operation with the parts as shown in Fig. 2,the opera- 13a shifted into an opposite position at the left are adaptedto drive said shaft in an 0 p0- m 254 is likewise provided with asegmental 12g to its bearing, the machine is not fully spring-connected.sleeves 254 and 259 are slid to the left, disengaging the outer sleevefrom the drivingalley and the inner sleeve from the shaft col ar, and bythe same movement en aging the outer sleeve with the shaft col ar andplacing the inner sleeve lug 270 in the plane of the brake-lever 271, sothat before the machine has completed-a full revolution after thesleeves have been thus shifted the rotatin In 270 on the inner of thetwo sleeves wil stri e the end 271 of the brake-lever and throw thebrake-shoe against the rotating brake surface on the cam or part 28 toarrest the machine. ,In arrestin the machine the first frictionalcontact 0 the brake-shoe with its brake surface serves to slow down themachine by the braking action thus produced; and the momentthebrake-shoe becomes firmly and finally seated upon its cooperating brakinsurface, so that no further movement of t e brake-shoe is permitted,then the said lever end becomes in effect a rigid or fixed stop toprevent further rotative movement of the inner sleeve 259. p

While the brake-shoe, as stated, serves to retard or slow down themachine in coming stopped until after the inner sleeve lug has met and'been arrested by the brake-shoe lever, and then the machine is arrestedonly through the coiled springs connecting said inner sleeve with theouter sleeve, which is now in engagement with the shaft collar, theeffect being, as the inner sleeve is brought to a state of rest, tocause said springs connecting it with the outer sleeve and the shaftcollarto be coiled up or put under tension until the inertia of therunning of the machine has been overcome and the machine brought to astate of rest. Of course, as these springs are gradually put undertension in the stopping of the machine their resistance or tensionincreases, iving a constantly increasing retarding effect in thedirection opposed to the rotation of the shaft and tendmg to arrest itby a cushioning or yielding action on the one hand and bracing thebrake-shoe with a constantly increasing pressure upon its brakingsurface on the other hand.

The machine having now been brought to a state of rest with the springsmore or less under tension the said springs will recover and, inuncoiling to their former or normal condition, will rotate said outersleeve in an opposite direction, correspondingly .turning the machine inan o posite or'retractive direction until the stop ug 279 on the outersleeve is brought. around against'and is arrested by contact with theend 271 of the brake-lever which first disengages the brakeshoe from itsbraking surface, moving the braking-lever backward against the bufier278 referred to, and bringing said outer sleeve, the collar shaft, andthe machine to a final stateof rest, which is invariably 1n the 'sameposition. This retractive, sprlng-actuated movement of the machinebefore it is finally brought to a state of rest, when the machine is asewin machine of the class here shown, is sufficient to produce thedesired retractive movement of the needle to cause it to cast off itsloop to permit the work to be removed from the machine. Thus when theconcentric sleeves are thrown to the right into full line position, F i2,.to start the machine the starting is e fe cted yieldingly through thecoiled springs referred to, thus eliminating any shock in starting.After the machine is in operation, when it is desired to arrest themachine and the sleeves are moved to the left, the machine first feelsthe retarding effectof the brake-shoe meeting its braking surface andsubstantially simultaneously therewith the cushioning or resilientstopping due to the winding up of the springs, followed immediately andautomatically by a recovery or reverse movement under the action of thesprings until the parts are finally brou ht to a state of rest in finalposition. his final, or spring-actuated, reverse movement which bringsthe machine to a final state of rest is in the machine shown so slightthat there is no objectionable shock in bringing it finally 'to a stateof rest in the one invariable position in which it is desired themachine shall be finally arrested.

My invention, of course, is not limited to the particular embodimenthere shown nor is it limited in its use to the particular machine shown,or to a sewing machine even; my invention being a plicable to anymachine to which it may e found adapted.

Having described one embodiment of my invention, and without limitingmyself to immaterial features and details, what I claim and desire tosecure by Letters Patent is 1. In a sewing machine, the combination witha driving shaft, of a driving pulley loosely mounted thereon, a collarsecured. against rotation on said shaft, a pair of cupshaped telescopingsleeves loose on said shaft and surrounding said collar, a yieldingconnection between said sleeves, means for connecting one of saidsleeves with the driving pulley, and means for connecting said sleevesalternately with said collar.

2. In a seating machine, the combination with a driving shaft, of meansfor driving the shaft including a yielding member, brake means for theshaft including a stop arm, a pair of stops carried by the drivingmeans, and provision for moving the driving means into position for oneof its stops to engage the brake stop arm to stop rotation of the shaftand tension said yielding be. eeaaeo member, and for its other saidbrake stop arm on relaxation of said yielding member after being"(3I1$1Q11,8Cl.

Wit-hi3 driving shaft, of a pair of sleeves loose on said shaft, ayielding connectionv between said sleeves, brake means including a brakestop arm, an'oppositely facing lug, on each sleeve constructed anarranged to, cooperate with the opposite faces of said stop arm, meanstoconnect said sleeves and shaft, means to rotate the sleeves, and proaision for moving said sleeves to bring their lugs iiito -operativerelation with said brake stop arm; g 4. In a sewing machine t-hecombination Withadriving shaft and a driving pulley loose thereon, of acollar secured to said shaft, a rotary IllQlIlbGI'dOOSG-Oll said shaftadjacent eachend of said collar, a, lug on stop to engage 1a yieldingconnection 1 said rotary member With the collar.

*each 'end of said collar, said lugs facing in opposite directions, alug on each rotary I meniber for engaging said eollar lugs, means 3. Ina sewing machine, the combination,=v

to connect one of said rotary members and said driving pulley andsimultaneously engage the Other rotary member and; collar, betweensaidrotary members Wherethrough the shaft isv driven, and means to stoprotation of'the shaft, including provision for disengaging the pulanditsrotary member and engaging In testimony whereof, I have signed myname to this specification, in the presence of two subscribingWitnesses. p

r THOMAS G. PLANT;

- lVitnesses:

FREDERICK L. EMERY, FRANCIS A. MILLS.

